v.變堅韌；變健壯；變頑固
This experience will toughen her. 這次經歷會讓他變堅韌。
The company leader said that army life would toughen the recruits up. 連長說軍隊生活可以使新兵鍛煉得更堅強。
All this mountain climbing will toughen the boys up. 這些爬山運動會把孩子們鍛煉得身強體壯。
